This is a recent polymer clay project I have done-took 8-month of my spare time to finish! Lots of details and trial-and-errors in the process.
1:13 simulating model of a '04 Audi A4
Step 1: Interior
There was actually 10+ more steps before getting to this step, including design, correct detailed car spec, break down into segments, measurement and etc. For simplicity I'll just show you an intermediate step which was the internal details.
Step 2: Exterior and Details
The original design was so that the glass are semi-transparent as in the real car, but the transparent clay I used was a bad one and appeared reddish after baking, so I have to paint the windows into solid color, which is unfortunate as now you won't see any interior details.